Abnormal isotopic shift of the broad band in the Mg1-xAlx10,11B2 superconductor

Parisiades, P; Lampakis, D; Palles, D; Liarokapis, E; Simonelli, L; Bianconi, A

dc.contributor.author	Parisiades, P	en
dc.contributor.author	Lampakis, D	en
dc.contributor.author	Palles, D	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Simonelli, L	en
dc.contributor.author	Bianconi, A	en
dc.date.accessioned	2014-03-01T01:25:51Z
dc.date.available	2014-03-01T01:25:51Z
dc.date.issued	2007	en
dc.identifier.issn	09214534	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17776
dc.subject	MgB2	en
dc.subject	Phonons	en
dc.subject	Raman scattering	en
dc.subject	Superconductivity	en
dc.subject.other	Magnesium compounds	en
dc.subject.other	Phonons	en
dc.subject.other	Polycrystalline materials	en
dc.subject.other	Raman scattering	en
dc.subject.other	Isotopic shift	en
dc.subject.other	Polycrystalline compounds	en
dc.subject.other	Superconductivity	en
dc.title	Abnormal isotopic shift of the broad band in the Mg1-xAlx10,11B2 superconductor	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.physc.2007.04.124	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.physc.2007.04.124	en
heal.publicationDate	2007	en
heal.abstract	We have studied the effect of aluminum doping and boron isotopic substitution on the Raman spectra of the Mg1-xAlx10,11B2 polycrystalline compounds. Our data show that new peaks appear at ∼740 and 870 cm-1 while the broad band at ∼600 cm-1 diminishes for higher Al doping levels. The high energy band evolves to the E2g phonon mode of AlB2 corresponding to a strong reduction in the electron-phonon coupling. The isotopic shift for the broad band at ∼600 cm-1 is small considering the isotopic shift of the other bands, which follow the harmonic mass law. This extreme anharmonic behavior indicates that the broad band may not be directly related with the E2g phonon of the B atoms. © 2007 Elsevier B.V. All rights reserved.	en
heal.journalName	Physica C: Superconductivity and its Applications	en
dc.identifier.doi	10.1016/j.physc.2007.04.124	en
dc.identifier.volume	460-462 I	en
dc.identifier.issue	SPEC. ISS.	en
dc.identifier.spage	612	en
dc.identifier.epage	613	en